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Tin alloy electroplating solution

A technology of electroplating solution and tin alloy, which is applied in the field of tin alloy electroplating solution, and can solve problems such as easy occurrence of tin whiskers and short circuit between two adjacent pins

Active Publication Date: 2018-06-01
WINSTAR CHEM SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For terminal tin-plated products with relatively small volume and high precision, tin whiskers are prone to appear after tin plating is completed. Most of the tin whiskers have a height of more than 100 μm, and two adjacent pins are likely to be generated in subsequent use. Problems such as short circuit

Method used

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  • Tin alloy electroplating solution

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preparation example Construction

[0033] The preparation method of described mercapto chitosan comprises the following steps:

[0034] Add chitosan, 1-hydroxybenzotriazole, and distilled water into the reactor, stir well, then add 2-mercapto-4-methyl-5-thiazoleacetic acid, 1-(3-dimethylaminopropyl )-3-ethylcarbodiimide hydrochloride, use 1mol / L sodium hydroxide to bring the pH of the reaction solution to 5, react at room temperature for 4h, add absolute ethanol, filter, dry under reduced pressure at 60°C for 10h, grind, Stored at low temperature at 5°C; the weight ratio of the chitosan to the 1-hydroxybenzotriazole and the distilled water is 1:0.7:30; the chitosan to the 2-mercapto-4-formazol The weight ratio of base-5-thiazoleacetic acid is 1:3.6; the 2-mercapto-4-methyl-5-thiazoleacetic acid and the 1-(3-dimethylaminopropyl)-3-ethyl carbon The molar ratio of diimine hydrochloride is 1:1.05; the weight ratio of the chitosan to the absolute ethanol is 1:10.

[0035] Chitosan has strong complexation and adsor...

Embodiment 1

[0064] The tin alloy electroplating solution includes organic mixed acid, organic tin salt, organic silver salt, complexing agent, reducing agent, stabilizer, refiner, brightener, deionized water; calculated by weight, 1000 parts of deionized water , 350 parts of organic mixed acid, 80 parts of organic tin salt, 2 parts of organic silver salt, 100 parts of complexing agent, 45 parts of reducing agent, 60 parts of stabilizer, 10 parts of refiner, 8 parts of brightener, 6 parts of surfactant share;

[0065] Wherein, the complexing agent is 2,4-dithiobiuret, N-methylguanidinoacetic acid, mercaptochitosan, and the 2,4-dithiobiuret and the N-methylguanidine Glycolic acid, the weight ratio of described mercapto chitosan is 1:0.24:0.72, and the preparation raw material of described mercapto chitosan comprises 2-mercapto-4-methyl-5-thiazole acetic acid, chitosan; The organic The mixed acid is citric acid and p-aminobenzenesulfonic acid, and the weight ratio of the citric acid to the ...

Embodiment 2

[0070] The tin alloy electroplating solution includes organic mixed acid, organic tin salt, organic silver salt, complexing agent, reducing agent, stabilizer, refiner, brightener, deionized water; calculated by weight, 1000 parts of deionized water , 350 parts of organic mixed acid, 80 parts of organic tin salt, 2 parts of organic silver salt, 100 parts of complexing agent, 45 parts of reducing agent, 60 parts of stabilizer, 10 parts of refiner, 8 parts of brightener, 6 parts of surfactant share;

[0071] Wherein, the complexing agent is 2,4-dithiobiuret, N-methylguanidinoacetic acid, mercaptochitosan, and the 2,4-dithiobiuret and the N-methylguanidine Glycolic acid, the weight ratio of described mercapto chitosan is 1:0.5:0.3, and the preparation raw material of described mercapto chitosan comprises 2-mercapto-4-methyl-5-thiazole acetic acid, chitosan; The organic The mixed acid is citric acid and p-aminobenzenesulfonic acid, and the weight ratio of the citric acid to the p-...

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Abstract

The invention provides a tin alloy electroplating solution. The tin alloy electroplating solution comprises organic mixed acid, organic tin salt, organic metal salt, complexing agents, reducing agents, stabilizing agents, refining agents, brightening agents and deionized water. The tin alloy electroplating solution comprises, by weight, 1000 parts of deionized water, 100-600 parts of organic mixedacid, 40-100 parts of organic tin salt, 1-8 parts of organic metal salt, 50-160 parts of complexing agents, 30-70 parts of reducing agents, 20-100 parts of stabilizing agents, 5-20 parts of refiningagents and 3-15 parts of brightening agents. The organic metal salt comprises one of organic silver salt, organic copper salt and organic bismuth salt. The complexing agents comprise one or more of thiourea, 1,3-dimethylthiourea, 2,4-dithiobiuret, 2,4,6-trithio-triuret, 2,2-dithiodipyridine, 2,2-dithio-aniline, tetramethyl guanidine, guanidinoacetic acid, creatine monohydrate and sulphydryl chitosan.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular, the invention relates to a tin alloy electroplating solution. Background technique [0002] In recent years, for example, electrification in the automotive field has been rapidly advanced, and the number of circuits of electrical equipment has increased accordingly. Therefore, the miniaturization and multi-pin connectors used have become remarkable. If the connector is multi-pin, even if the insertion force for each pin is small, the connector as a whole requires a large force when inserting the connector, which may lower productivity. Therefore, attempts were made to reduce the insertion force per pin by reducing the coefficient of friction of the tin-plated copper alloy material. [0003] Tin-plated copper alloy terminal material is widely used as a terminal material by performing copper plating and tin plating on a base material made of copper alloy, followed by reflow t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/60
CPCC22C9/00C25D3/60
Inventor 张志恒
Owner WINSTAR CHEM SHANGHAI
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